Detailed Explanation:

Answer: Option 4 — Yemen and South Sudan

Yemen and South Sudan have experienced severe humanitarian crises with lakhs of people suffering from acute malnutrition and starvation due to prolonged armed conflicts. In Yemen, the civil war beginning in 2014 and the subsequent Saudi-led coalition intervention against Houthi rebels created a catastrophic humanitarian situation, with blockades restricting food and medical supplies leading to widespread famine conditions. In South Sudan, the civil war that erupted in 2013 between government and opposition forces displaced millions, disrupted agriculture, and led to the UN declaring famine in parts of the country in February 2017, making it the first famine declared anywhere in six years.

The other options do not match the severity and recency described in the question. Angola and Zambia have not faced such crises recently; Morocco and Tunisia have been relatively stable; Venezuela has faced economic collapse and food shortages, but Colombia has not experienced similar war-induced famine conditions.